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LT1580IT#06PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
4
LT1580/LT1580-2.5
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum V
POWER
: LT1580-2.5 V
CONTROL
= 5V, I
LOAD
= 100mA ● 0.10 0.17 V
(V
POWER
– V
OUT
)V
CONTROL
= 5V, I
LOAD
= 1A ● 0.15 0.22 V
V
CONTROL
= 5V, I
LOAD
= 4A, T
J
= 25°C 0.34 0.40 V
V
CONTROL
= 5V, I
LOAD
= 4A ● 0.50 V
V
CONTROL
= 5V, I
LOAD
= 7A, T
J
= 25°C 0.54 0.62 V
V
CONTROL
= 5V, I
LOAD
= 7A, 0°C ≤ T
J
≤ 125°C 0.70 0.80 V
V
CONTROL
= 5V, I
LOAD
= 6.5A, –40°C ≤ T
J
≤ 0°C 0.70 0.80 V
Minimum V
POWER
: LT1580 V
CONTROL
= 2.75V, I
LOAD
= 100mA ● 0.10 0.17 V
(V
POWER
– V
OUT
)V
CONTROL
= 2.75V, I
LOAD
= 1A ● 0.15 0.22 V
(V
ADJ
= 0V) V
CONTROL
= 2.75V, I
LOAD
2.75A ● 0.26 0.38 V
V
CONTROL
= 2.75V, I
LOAD
= 4A, T
J
= 25°C 0.34 0.40 V
V
CONTROL
= 2.75V, I
LOAD
= 4A ● 0.50 V
V
CONTROL
= 2.75V, I
LOAD
= 7A, T
J
= 25°C 0.54 0.62 V
V
CONTROL
= 2.75V, I
LOAD
= 7A, 0°C ≤ T
J
≤ 125°C 0.70 0.80 V
V
CONTROL
= 2.75V, I
LOAD
= 6.5A, –40°C ≤ T
J
≤ 0°C 0.70 0.80 V
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Unless otherwise specified V
OUT
= V
SENSE
. For the LT1580
adjustable device V
ADJ
= 0V.
Note 2: For the LT1580, dropout is caused by either minimum control
voltage (V
CONTROL
) or minimum power voltage (V
POWER
). Both parameters
are specified with respect to the output voltage. The specifications represent
the minimum input/output voltage required to maintain 1% regulation.
Note 3: For the LT1580 adjustable device the minimum load current is the
minimum current required to maintain regulation. Normally the current in
the resistor divider used to set the output voltage is selected to meet the
minimum load current requirement.
Note 4: The control pin current is the drive current required for the output
transistor. This current will track output current with roughly a 1:100 ratio.
The minimum value is equal to the quiescent current of the device.
OUTPUT CURRENT (A)
0
MINIMUM POWER VOLTAGE (V)
1.0
0
1
5
7
1580 G03
4
2
3
6
0.5
DATA SHEET LIMIT
T
J
= 25°C
T
J
= 125°C
INDICATES GUARANTEED TEST POINTS
0°C ≤ T
J
≤ 125°C
OUTPUT CURRENT (A)
0
MINIMUM CONTROL VOLTAGE
(V
CONTROL
– V
OUT
) (V)
2
0
1
5
7
1580 G02
4
2
3
6
1
DATA SHEET LIMIT
T
J
= 25°C
T
J
= 125°C
INDICATES GUARANTEED TEST POINTS
0°C ≤ T
J
≤ 125°C
Dropout Voltage—
Minimum Power Voltage
Control Pin Current
vs Output Current
OUTPUT CURRENT (A)
0
140
120
100
80
60
40
20
0
35
1580 G01
12
467
CONTROL PIN CURRENT (mA)
DATA SHEET LIMIT
TYPICAL
DEVICE
INDICATES GUARANTEED TEST POINTS
0°C ≤ T
J
≤ 125°C
Minimum Control Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
UW
5
LT1580/LT1580-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50 –25
OUTPUT VOLTAGE (V)
150
1580 G05
0 25 75 125
50
100
2.508
2.506
2.504
2.502
2.500
2.498
2.496
2.494
2.492
TEMPERATURE (°C)
–50 –25
REFERENCE VOLTAGE (V)
150
1580 G04
0 25 75 125
50
100
1.258
1.256
1.254
1.252
1.250
1.248
1.246
1.244
1.242
LT1580 Reference Voltage
vs Temperature
400mA
LT1580-2.5 Output Voltage
vs Temperature
7A
V
OUT
50mV/DIV
LOAD
50µs/DIV 1580 TA02
Load Current Step Response
PIN FUNCTIONS
UUU
(5-Lead/7-Lead)
SENSE (Pin 1): This pin is the positive side of the reference
voltage for the device. With this pin it is possible to Kelvin
sense the output voltage at the load.
ADJ (Pin 2/5):
This pin is the negative side of the
reference voltage for the device. Transient response can
be improved by adding a small bypass capacitor from the
ADJ pin to ground. For fixed voltage devices the ADJ pin
is also brought out to allow the user to add a bypass
capacitor
.
GND (Pin 2, 7-Lead Only): For fixed voltage devices this
is the bottom of the resistor divider that sets the output
voltage.
V
POWER
(Pin 5/6): This is the collector to the power device
of the LT1580. The output load current is supplied through
this pin. For the device to regulate, the voltage at this pin
must be between 0.1V and 0.8V greater than the output
voltage (see Dropout specifications).
V
CONTROL
(Pin 4/3): This pin is the supply pin for the
control circuitry of the device. The current flow into this
pin will be about 1% of the output current. For the device
to regulate, the voltage at this pin must be between 1.0V
and 1.3V greater than the output voltage (see Dropout
specifications).
V
OUT
(Pin 3/4): This is the power output of the device.
6
LT1580/LT1580-2.5
BLOCK DIAGRA
W
–
+
V
CONTROL
V
POWER
SENSE
V
OUT
1580 BD
FOR FIXED
VOLTAGE
DEVICE
GND
ADJ
APPLICATIONS INFORMATION
WUU
U
The LT1580 is a low dropout regulator designed to power
the new generation of microprocessors. Low dropout
regulators have become more common in desktop com-
puter systems as microprocessor manufacturers have
moved away from 5V only CPUs. A wide range of supply
requirements exists today with new voltages just over the
horizon. In many cases the input-output differential is very
small, effectively disqualifying many of the low dropout
regulators on the market today. The LT1580 is designed to
make use of multiple power supplies, present in most
systems, to reduce the dropout voltage. This two supply
approach maximizes efficiency.
The second supply, at least 1V greater than the output
voltage, is used to provide power for the control circuitry
and supply the drive current to the NPN output transistor.
This allows the NPN to be driven into saturation, thereby
reducing the dropout voltage by a V
BE
compared to
conventional designs. The current requirement for the
control voltage is relatively small, equal to approximately
1% of the output current or about 70mA for a 7A load. The
bulk of this current is drive current for the NPN output
transistor. This drive current becomes part of the output
current.
The control voltage must be at least 1V greater than the
output voltage to obtain optimum performance. The maxi-
mum voltage on the V
CONTROL
pin is 13V. The maximum
voltage at the V
POWER
pin is limited to 7V. GDN pin current
for fixed voltage devices is 6mA (typ) and is constant as a
function of load. ADJ pin current for adjustable devices is
60µA at 25°C and varies proportional to absolute tempera-
ture.
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LT1580IT#06PBF

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Buy LT1580IT#06PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators 7A Low Dropout HS Voltage Reg
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